Python 313 Release Notes Verified

This is a landmark change, but treat it as a preview. Do not run your production web server with python3.13t yet.

pyenv install 3.13.0 pyenv global 3.13.0 python --version # Should output Python 3.13.0

Before diving into the technical weeds, here is the verified list of headline features in Python 3.13, confirmed against the official WhatsNew document and the CPython 3.13.0 source code:

| Area | Improvement | |------|--------------| | list.append | ~10% faster due to reduced reference counting | | json module | Parsing speed up by 15-20% | | asyncio | Task creation and scheduling ~30% faster | | compile() | Bytecode compilation cache improvements |

All information verified against cpython-3.13.0 tag, official Misc/NEWS.d entries, and PEP 703 (free-threaded), PEP 744 (JIT), and the Python 3.13 "What's New" documentation.

This is the first step toward a Just-In-Time (JIT) compiler for CPython.